diff --git a/pair_sum.py b/pair_sum.py
index e69de29..cc41f05 100644
--- a/pair_sum.py
+++ b/pair_sum.py
@@ -0,0 +1,15 @@
+def pairSum(lista,num1):
+    final_list = []
+    lista.sort()
+    lower = 0
+    upper = len(lista) - 1
+    while lower < upper:
+        if lista[lower] + lista [upper] == num1:
+            lower +=1
+            upper -=1
+            final_list.append((lista[lower],lista[upper]))
+        elif lista[lower] + lista [upper] < num1:
+             lower +=1
+        else:
+            upper -=1
+    return final_list
diff --git a/pair_sum.pyc b/pair_sum.pyc
new file mode 100644
index 0000000..bc4ea25
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..65388e6
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diff --git a/tests/test_pairSum.pyc b/tests/test_pairSum.pyc
new file mode 100644
index 0000000..597adee
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